Stator core, stator assembly, motor and electrical equipment

Abstract

The utility model discloses a stator core, a stator assembly, a motor and electrical equipment. The stator core comprises a plurality of stator teeth, each stator tooth comprises a tooth part, a tooth boot and a matching part, the tooth parts extend in the radial direction of the stator core, the two radial ends of each tooth part are connected with the matching parts and the tooth boots respectively, the stator teeth are arranged in the circumferential direction of the stator core, and the tooth boots are arranged in the circumferential direction of the stator core. The sizes of the matching parts along the circumferential direction of the stator iron core are gradually reduced in the direction far away from the tooth parts, and the matching parts of the plurality of stator teeth are connected end to end along the circumferential direction of the stator iron core to define a stator hole. According to the stator iron core provided by the embodiment of the utility model, the matching parts of the plurality of stator teeth are spliced and connected, so that the stator winding and the stator iron core are easier to assemble, the assembling efficiency is improved, and the slot fullness rate of the stator winding in the stator slot can be higher, thereby being beneficial to improving the torque density and the motor operation efficiency, and improving the motor performance.

Description

Technical Field

[0001] The utility model relates to the technical field of stators, and more specifically, to a stator core, a stator assembly, a motor and an electrical device. Background Art

[0002] In the related art, the slot fill rate of the stator assembly is low, which affects the torque density and the improvement of the motor operating efficiency, resulting in the motor performance being unable to meet the requirements. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the utility model is to provide a stator core, wherein the stator core improves torque density and operating efficiency.

[0004] The utility model also provides a stator assembly having the stator core.

[0005] The utility model also provides a motor with the stator assembly.

[0006] The utility model also provides an electrical device having the motor.

[0007] According to the stator core of the embodiment of the utility model, it includes: a plurality of stator teeth, wherein the stator teeth include a tooth portion, a tooth shoe and a matching portion, wherein the tooth portion extends radially along the stator core, and the radial ends of the tooth portion are respectively connected to the matching portion and the tooth shoe, wherein the plurality of stator teeth are arranged along the circumferential direction of the stator core, the size of the matching portion along the circumferential direction of the stator core decreases in the direction away from the tooth portion, and the matching portions of the plurality of stator teeth are connected end to end along the circumferential direction of the stator core to define a stator hole.

[0008] According to the stator core of the embodiment of the utility model, the matching parts of multiple stator teeth are spliced ​​and connected, so that the stator winding and the stator core are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0009] In addition, the stator core according to the above embodiment of the utility model may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the two side surfaces of the matching portion in the circumferential direction of the stator core are respectively a first side surface and a second side surface, one of the first side surface and the second side surface extends parallel to the radial direction of the tooth portion, and the other extends obliquely relative to the radial direction of the tooth portion.

[0011] According to some embodiments of the present invention, two side surfaces of the matching portion in the circumferential direction of the stator core are respectively a first side surface and a second side surface, and both the first side surface and the second side surface extend obliquely relative to the radial direction of the tooth portion.

[0012] According to some embodiments of the present invention, the shapes of the side surfaces of two adjacent matching parts facing each other match, and the two adjacent matching parts have a clearance fit, a transition fit, or an interference fit.

[0013] According to some embodiments of the present invention, one of the mutually opposite side surfaces of two adjacent matching portions is provided with at least one first limiting recess, and the other is provided with a first limiting protrusion which is inserted into the first limiting recess in a one-to-one correspondence.

[0014] According to some embodiments of the utility model, the mutually opposite sides of two adjacent matching parts are each provided with at least one first limiting recess and at least one first limiting protrusion, and the first limiting protrusion of one of the side surfaces is inserted into the first limiting recess of the other side surface.

[0015] According to some embodiments of the present invention, the structures of the plurality of matching portions are the same.

[0016] According to some embodiments of the utility model, the multiple matching parts include a first matching part and a second matching part, the two side surfaces of the first matching part are provided with a first limiting recess, the two side surfaces of the second matching part are provided with a first limiting protrusion, and the first matching parts and the second matching parts are alternately arranged along the circumferential direction of the stator core.

[0017] According to some embodiments of the utility model, the tooth boot is provided with a slot, and the end of the tooth portion radially away from the matching portion is provided with an inserting portion, and the inserting portion is inserted into the slot.

[0018] According to some embodiments of the present invention, the shape of the slot matches the shape of the plug-in portion, and the outer surface of the plug-in portion has a clearance fit, a transition fit, or an interference fit with the slot wall surface.

[0019] According to some embodiments of the utility model, the size of the plug-in portion along the circumference of the stator core is equal to the size of the tooth portion along the circumference of the stator core; or, the plug-in portion is provided with a second limiting recess on the surface of at least one side of the circumference of the stator core and one of the slot side walls of the slot, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or, the size of the plug-in portion along the circumference of the stator core decreases in the direction away from the mating portion.

[0020] According to some embodiments of the present invention, the dimensions of the teeth along the circumference of the stator core are equal everywhere, the teeth are made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the teeth.

[0021] According to some embodiments of the utility model, a side surface of the tooth shoe facing the tooth portion extends perpendicular to the radial direction of the stator core; or, a side surface of the tooth shoe facing the tooth portion is an arc-shaped surface, and the central axis of the arc-shaped surface coincides with the axis of the stator core.

[0022] The stator assembly according to the embodiment of the present invention comprises a stator winding and a stator core according to the embodiment of the present invention, wherein the stator winding is wound around the tooth portion.

[0023] According to some embodiments of the present invention, the stator assembly includes a plastic-encapsulating body, wherein the plastic-encapsulating body encapsulates the stator core and the stator winding.

[0024] The motor according to the embodiment of the present invention comprises a rotor assembly and a stator assembly according to the embodiment of the present invention.

[0025] According to some embodiments of the present invention, the number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth is greater than 3 and less than 30; and the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6.

[0026] The electrical equipment according to the embodiment of the utility model is characterized by comprising the motor according to the embodiment of the utility model.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 It is a structural schematic diagram of a stator core according to an embodiment of the utility model;

[0030] Figure 2 yes Figure 1 A schematic diagram of the structure of multiple stator teeth;

[0031] Figure 3 yes Figure 1 Schematic diagram of the structure of a stator tooth;

[0032] Figure 4 There are two Figure 1 Schematic diagram of the arrangement of stator teeth of the stator core during the production process;

[0033] Figure 5 is a schematic structural diagram of a stator tooth according to a second embodiment of the utility model;

[0034] Figure 6 is a schematic structural diagram of a stator core according to a third embodiment of the utility model;

[0035] Figure 7 yes Figure 6 Schematic diagram of the structure of a stator tooth;

[0036] Figure 8 is a schematic structural diagram of a stator core according to a fourth embodiment of the utility model;

[0037] Fig. 9 yes Figure 8 Schematic diagram of the structure of a stator tooth;

[0038] Fig.10 is a schematic structural diagram of a stator core according to a fifth embodiment of the utility model;

[0039] Fig.11 yes Fig.10 Schematic diagram of the structure of a stator tooth;

[0040] Fig.12 yes Fig.10 Schematic diagram of the structure of another stator tooth.

[0041] Reference numerals:

[0042] Stator core 100;

[0043] Stator tooth 10; first position limiting concave portion 101; first position limiting convex portion 102;

[0044] Tooth portion 11 ; plug portion 111 ; tooth shoe 12 ; slot 121 ; matching portion 13 ; first side surface 131 ; second side surface 132 . DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0048] In the related art, the stator core of the stator assembly is an integrated structure. When the stator winding is assembled with the stator core, the stator winding needs to be radially installed into the stator slot through the stator slot opening. In order to achieve stable installation and positioning of the stator winding on the stator core, the stator core has a tooth boot to limit the stator winding into the stator slot. The tooth boot is set so that the opening size of the stator slot along the circumference of the stator core is smaller than the size in the stator slot. It is inconvenient to install the stator winding into the stator slot, and the size of the stator winding cannot be too large. This leads to a low slot fill rate in the stator slot, and then a low torque density and motor operating efficiency, which greatly affects the motor manufacturing efficiency and performance.

[0049] Based on this, the present application proposes a stator core 100, which is spliced ​​and connected through the mating parts 13 of multiple stator teeth 10, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0050] The stator core 100 , the stator winding and the motor according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0051] Reference Figure 1-Figure 3 As shown, the stator core 100 according to the embodiment of the present invention may include: a plurality of stator teeth 10 .

[0052] Specifically, the stator tooth 10 includes a tooth portion 11, a tooth shoe 12 and a matching portion 13. The tooth portion 11 extends radially along the stator core 100, and the radial ends of the tooth portion 11 are respectively connected to the matching portion 13 and the tooth shoe 12. Among them, a plurality of stator teeth 10 are arranged along the circumference of the stator core 100, and the size of the matching portion 13 along the circumference of the stator core 100 decreases in the direction away from the tooth portion 11. The matching portions 13 of the plurality of stator teeth 10 are connected end to end along the circumference of the stator core 100 to define a stator hole. Thus, a stator slot is defined between two adjacent stator teeth 10, and the matching portion 13 and the tooth shoe 12 connected to each other can be limited by the radial inner side and radial outer side of the stator slot.

[0053] The stator assembly according to the embodiment of the utility model includes a stator winding and a stator core 100 according to the embodiment of the utility model, and the stator winding is wound on the tooth portion 11 of the stator tooth 10. Thus, the stator winding can be installed on the stator core 100, and part of the stator winding is located in the stator slot, and the matching portion 13 and the tooth shoe 12 can limit the stator winding from both radial sides of the tooth portion 11, so that the stator winding and the stator core 100 installation structure are stable.

[0054] The motor according to the embodiment of the utility model comprises a rotor assembly and a stator assembly according to the embodiment of the utility model. The rotor assembly is arranged around the stator assembly or the stator assembly is arranged around the rotor assembly, so that the motor is formed into an inner rotor motor or an outer rotor motor. The stator assembly cooperates with the rotor assembly to rotate the rotor assembly to realize the operation of the motor.

[0055] In addition, during the assembly of the stator assembly, the stator winding can be first sleeved on the tooth portion 11 of the stator tooth 10, and then the multiple stator teeth 10 can be spliced ​​and connected through the matching portion 13. When installing the stator winding, since the multiple stator teeth 10 are separated from each other, the installation of the stator winding is not interfered with by adjacent stator teeth 10, nor is it limited by the size of the stator slot. The cross-sectional size of the stator winding can be larger without affecting the installation, and after the multiple stator teeth 10 are assembled, the position of the stator winding in the stator slot can be flexibly adjusted, so that the stator winding can occupy as much space in the stator slot as possible, improve the slot fill rate, and then improve the torque density and motor operating efficiency, and improve the motor performance. In addition, the assembly of the stator assembly is easier, which greatly improves the manufacturing efficiency.

[0056] When the plurality of stator teeth 10 are separated from each other, it is also beneficial to improve production efficiency and material utilization rate in the process of manufacturing the stator teeth 10. Specifically, the stator teeth 10 can be formed by stacking a plurality of tooth punchings in the thickness direction. The tooth punchings are formed by a stamping process, and the stator teeth 10 are generally formed into a T-shaped structure. When processing the tooth punchings, such as Figure 4As shown, upright T-shaped tooth punches and inverted T-shaped tooth punches can be punched out on a large-area plate, so that a larger number of tooth punches can be processed per unit area of ​​the plate, thereby improving material utilization.

[0057] In addition, the circumferential dimension of the mating portion 13 decreases in the direction away from the tooth portion 11, so that the mating portion 13 forms a trapezoidal or triangular structure, making it easier to assemble the mating portions 13 of multiple stator teeth 10, more convenient to operate, and more efficient to assemble. Figure 3 As shown, the circumferential width of the radial outer end of the mating portion 13 is equal to the circumferential width of the radial inner end of the tooth portion 11, and the stator tooth 10 as a whole is generally formed into a T-shaped structure. There is no need to set up a yoke structure separately. The end of the stator tooth 10 is used as a yoke, and the structure is simpler.

[0058] According to the stator core 100 of the embodiment of the utility model, the matching parts 13 of multiple stator teeth 10 are spliced ​​and connected, so that the stator winding and the stator core 100 are easier to assemble, and the assembly efficiency is improved. The slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0059] Since the stator core 100 according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the stator assembly according to the embodiment of the utility model is spliced ​​and connected through the matching parts 13 of multiple stator teeth 10, so that the stator winding and the stator core 100 are easier to assemble, and the assembly efficiency is improved. The slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0060] Since the stator assembly according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the motor according to the embodiment of the utility model is spliced ​​and connected through the matching parts 13 of multiple stator teeth 10, so that the stator winding and the stator core 100 are easier to assemble, and the assembly efficiency is improved. The slot fill rate of the stator winding in the stator slot can be higher, which is beneficial to improve the torque density and motor operating efficiency, and improve the motor performance.

[0061] According to some embodiments of the present invention, Figure 3 As shown, the two side surfaces of the matching portion 13 in the circumferential direction of the stator core 100 are respectively a first side surface 131 and a second side surface 132. The first side surface 131 and the second side surface 132 can extend from the radial outer end to the radial inner end along a straight line, an arc line, or a broken line, as long as the width of the matching portion 13 can be gradually reduced in the direction away from the tooth portion 11.

[0062] For example, one of the first side surface 131 and the second side surface 132 extends parallel to the radial direction of the tooth portion 11, and the other extends obliquely relative to the radial direction of the tooth portion 11. Thus, only one of the first side surface 131 and the second side surface 132 is processed into an inclined surface, and the other side surface can be coplanar with the side surface of the tooth portion 11, so that the structure of the stator tooth 10 is simpler and easier to process, and the front and back sides of the stator tooth 10 can be distinguished according to the shapes of the first side surface 131 and the second side surface 132, which is conducive to improving assembly efficiency.

[0063] For example, Figure 3 As shown, the two side surfaces of the matching portion 13 in the circumferential direction of the stator core 100 are respectively a first side surface 131 and a second side surface 132, and the first side surface 131 and the second side surface 132 are both extended obliquely relative to the radial direction of the tooth portion 11. The stator tooth 10 has better symmetry about the radial direction, which is conducive to improving performance.

[0064] In some embodiments of the present invention, Figure 1 , Figure 6 , Figure 8 and Fig.10 As shown, the shapes of the sides of two adjacent matching portions 13 facing each other match, and the two adjacent matching portions 13 are clearance fit, transition fit or interference fit.

[0065] In the above embodiment, no cavity is formed between the mating parts 13 of two adjacent stator teeth 10, that is, there is no large gap, thereby reducing or avoiding the formation of an air gap in the yoke formed by the mating parts 13, which is beneficial to reducing magnetic strength loss, reducing magnetic resistance, and improving motor performance.

[0066] According to some embodiments of the present invention, Figure 6-Figure 12 As shown, one of the mutually opposite sides of two adjacent matching portions 13 is provided with at least one first limiting recess 101 , and the other is provided with a first limiting protrusion 102 which is inserted into the first limiting recess 101 in a one-to-one correspondence.

[0067] Alternatively, according to other embodiments of the present invention, at least one first limiting recess 101 and at least one first limiting protrusion 102 are provided on the opposite sides of two adjacent matching portions 13, and the first limiting protrusion 102 on one side is inserted into the first limiting recess 101 on the other side.

[0068] For example, in two adjacent matching portions 13, the first side surface 131 of one matching portion 13 and the second side surface 132 of the other matching portion 13 are opposite to each other, the opposite first side surface 131 is provided with at least one first limiting recess 101, and the second side surface 132 is provided with a first limiting protrusion 102 corresponding to the first limiting recess 101 on the first side surface 131; or the opposite first side surface 131 is provided with at least one first limiting protrusion 102, and the second side surface 132 is provided with a first limiting protrusion 102 corresponding to the first limiting protrusion 102 on the first side surface 131. or, the opposite first side surface 131 is provided with at least one first limiting protrusion 102 and at least one first limiting concave 101, and the second side surface 132 is also provided with at least one first limiting protrusion 102 and at least one first limiting concave 101, but the first limiting protrusion 102 of the first side surface 131 and the first limiting concave 101 of the second side surface 132 are opposite to and matched one by one, and the first limiting concave 101 of the first side surface 131 and the first limiting protrusion 102 of the second side surface 132 are opposite to and matched one by one.

[0069] By cooperating with the first limiting protrusion 102 and the first limiting recess 101 , two adjacent stator teeth 10 can be limited in the radial direction, and the multiple stator teeth 10 can be more reliably matched and not easily separated.

[0070] It is worth noting that, for the matching portion 13 of the same stator tooth 10, the first side surface 131 and the second side surface 132 may be provided with the first limiting protrusion 102 and the first limiting recess 101 in the same or different manner. Figure 6 and Figure 7 As shown, a first position-limiting protrusion 102 is provided on the first side surface 131 of the matching portion 13 and a first position-limiting recess 101 is provided on the second side surface 132. Figure 8 and Fig. 9 As shown, the first side surface 131 of the matching portion 13 is provided with two first limiting protrusions 102 and the second side surface 132 is provided with two first limiting recesses 101. Of course, the number of the first limiting protrusions 102 and the first limiting recesses 101 provided on the first side surface 131 and the second side surface 132 can also be three or more, which is within the protection scope of the present utility model.

[0071] For example Figure 10-12 As shown, the multiple matching parts 13 may include a first matching part and a second matching part, the two side surfaces of the first matching part (i.e., the first side surface 131 and the second side surface 132) are respectively provided with a first limiting recess 101, and the two side surfaces of the second matching part (i.e., the first side surface 131 and the second side surface 132) are respectively provided with a first limiting protrusion 102, and the first matching part and the second matching part are alternately arranged and matched along the circumference of the stator core 100, so that the first limiting protrusion 102 of the second matching part is inserted into the first limiting recess 101 of the first matching part.

[0072] In some specific embodiments, Figure 6-Figure 9 As shown, the structures of the multiple matching parts 13 are the same. In other words, the first limiting protrusions 102 and the first limiting recesses 101 are provided on the first side surfaces 131 of the multiple matching parts 13 in the same manner, and the first limiting protrusions 102 and the first limiting recesses 101 are provided on the second side surfaces 132 of the multiple matching parts 13 in the same manner. The multiple matching parts 13 have the same structure, which can simplify the processing procedures, or can be processed and formed using the same processing tools. For example, the structures of the multiple stator teeth 10 are the same, which can further reduce the processing difficulty and improve the manufacturing efficiency.

[0073] According to some embodiments of the present invention, Figure 5 As shown, the tooth shoe 12 is provided with a slot 121 , and the tooth portion 11 is provided with an inserting portion 111 at an end portion away from the matching portion 13 in the radial direction, and the inserting portion 111 is inserted into the slot 121 .

[0074] During the assembly of the stator assembly, the stator winding can be first sleeved on the tooth portion 11, and then the tooth boot 12 can be plugged and connected to the tooth portion 11 through the plug-in portion 111 and the slot 121. When installing the stator winding, since the tooth boot 12 is separated from the tooth portion 11, and the stator teeth 10 are separated from each other, the stator slot is not blocked by the tooth boot 12, and the stator winding is not interfered with by other stator teeth 10, the space available for the stator winding to move is large, and the installation of the stator winding is not affected by the size of the stator slot. Therefore, the cross-sectional size of the stator winding can be larger without affecting the installation, and the position of the stator winding in the stator slot is easier to adjust, so that the stator winding can occupy as much space in the stator slot as possible, improve the slot fill rate, and then improve the torque density and motor operating efficiency, and improve the motor performance. In addition, the assembly of the stator assembly is easier, which greatly improves the manufacturing efficiency.

[0075] In some embodiments, continue to refer to Figure 5 As shown, the shape of the slot 121 matches the shape of the plug-in portion 111 , and the outer surface of the plug-in portion 111 and the groove wall surface of the slot 121 have a clearance fit, a transition fit, or an interference fit.

[0076] In the above embodiment, no cavity is formed between the slot wall surface of the slot 121 and the outer surface of the plug-in portion 111, that is, no large gap is formed, thereby reducing or avoiding the formation of an air gap, which is beneficial to reducing magnetic strength loss, reducing magnetic resistance, and improving motor performance.

[0077] For example, the slot 121 is a rectangular slot, and the plug-in portion 111 is a rectangular structure; the slot 121 is a trapezoidal slot, and the plug-in portion 111 is a trapezoidal structure, etc. The specific structures of the slot 121 and the plug-in portion 111 can be flexibly set according to actual conditions.

[0078] In some embodiments, Figure 5 As shown, the size of the plug-in portion 111 along the circumferential direction of the stator core 100 is equal to the size of the tooth portion 11 along the circumferential direction of the stator core 100. The tooth portion 11 has a simpler structure and is easier to process and shape, and the size of the plug-in portion 111 is more suitable, which is conducive to improving the strength of the plug-in portion 111, and then improving the matching strength between the plug-in portion 111 and the slot wall of the slot 121. In the embodiment where the tooth portion 11 is made of oriented silicon steel, the plug-in portion 111 can also be made of oriented silicon steel, and the plug-in portion 111 and the tooth portion 11 have the same size along the circumferential direction, so that the plug-in portion 111 is more beneficial to improving the performance of the motor.

[0079] In some embodiments, the plug-in portion 111 is provided with a second limiting recess on one of at least one side surface of the stator core 100 in the circumferential direction and the slot side wall of the slot 121, and the other is provided with a second limiting protrusion embedded in the second limiting recess. Through the cooperation of the second limiting protrusion and the second limiting recess, the tooth portion 11 and the tooth shoe 12 can be limited in the radial direction, and the tooth portion 11 and the tooth shoe 12 cooperate more reliably and are not easy to separate.

[0080] In some embodiments, the dimension of the plug-in portion 111 along the circumferential direction of the stator core 100 decreases in the direction away from the mating portion 13. The plug-in portion 111 is formed into a trapezoidal or triangular structure. During the assembly process, the tooth portion 11 can move radially to achieve assembly with the tooth shoe 12, with low assembly resistance and more convenient and quick assembly. In the embodiment where the tooth portion 11 is made of oriented silicon steel, the plug-in portion 111 of the above structure can also be made of oriented silicon steel.

[0081] According to some embodiments of the present invention, Figure 3 , Figure 5 , Figure 7 , Fig. 9 and Figure 11-Figure 12 As shown, the size of the tooth portion 11 along the circumferential direction of the stator core 100 is equal everywhere. The cross section of the tooth portion 11 perpendicular to the axial direction is generally formed into a rectangular shape, which is easy to process.

[0082] In some embodiments, the tooth portion 11 is made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion 11. The saturation magnetic induction of oriented silicon steel is high, which can reduce current and copper loss; and the iron loss is low, which can reduce iron loss. Therefore, the use of oriented silicon steel in the tooth portion 11 can further improve the torque and motor operating efficiency, which is beneficial to improving the performance of the motor.

[0083] It is worth noting that since the dimensions of the tooth 11 along the circumference of the stator core 100 are equal everywhere, the tooth 11 can be made of oriented silicon steel while ensuring higher performance, while other irregularly shaped teeth 11 cannot use oriented silicon steel without affecting performance.

[0084] Among them, the circumferential width of the matching portion 13 decreases gradually in the direction away from the tooth portion 11. The matching portion 13 and the tooth portion 11 can be integrally formed and both use oriented silicon steel, which is more conducive to improving performance. In the case where the matching portion 13 is provided with a first limiting protrusion 102 or a first limiting recess 101, since the matching portion 13 does not directly cooperate with the stator winding, oriented silicon steel can also be used, but it will not have an adverse effect on the performance.

[0085] In some embodiments of the present invention, Figure 3 As shown, the side surface of the tooth shoe 12 facing the tooth portion 11 can extend perpendicularly to the radial direction of the stator core 100; or, the side surface of the tooth shoe 12 facing the tooth portion 11 is an arc surface, and the central axis of the arc surface coincides with the axis of the stator core 100. This can enable the tooth shoe 12 to achieve a good limiting effect on the stator winding without affecting the size of the space in the stator slot. The stator slot can be as large as possible to improve the torque density and motor operation efficiency.

[0086] In some embodiments of the present invention, the stator assembly includes an overmolded body, which overmoldes the stator core 100 and the stator winding. The overmolded body can be formed by an injection molding process, for example, the material of the overmolded body includes but is not limited to bulk molding compound (BMC).

[0087] During the production process, the assembled stator core 100 and stator winding can be placed in an injection mold, and then the overmolding body is injected. The overmolding body obtained by injection molding can overmold the stator core 100 and the stator winding at the same time, which can reduce the assembly process and improve production efficiency. On the other hand, the overmolding body can provide waterproof insulation and other protective effects on the stator core 100 and the stator winding, reducing corrosion and damage to the stator core 100 and the stator winding. In addition, the overmolding body can further fix the splicing structure between the stator teeth 10 of the stator core 100 to improve the integrity and structural stability of the stator core 100.

[0088] It is worth noting that the overmolding body may completely wrap the stator core 100 and the stator winding, or the overmolding body may partially wrap the stator core 100 and the stator winding, which are all within the protection scope of the present utility model.

[0089] In some embodiments of the present invention, the number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth 10 is greater than 3 and less than 30, and the number of corresponding stator slots is equal to the number of teeth Ns; the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6. Within the above range of values, the number of poles of the rotor assembly is more matched with the number of slots of the stator assembly, meeting the application requirements of most motors.

[0090] In some specific embodiments, the number Ns of the stator teeth 10 may be 9 or 12, etc., and the number Np of the poles of the rotor assembly may be 8, 10, 12, 14, etc.

[0091] The electrical device according to the embodiment of the utility model includes the motor according to the embodiment of the utility model. Since the motor according to the embodiment of the utility model has the above-mentioned beneficial technical effects, the electrical device according to the embodiment of the utility model is connected by splicing the matching parts 13 of the plurality of stator teeth 10, so that the stator winding and the stator core 100 are easier to assemble, the assembly efficiency is improved, and the slot fill rate of the stator winding in the stator slot can be higher, which is conducive to improving the torque density and the motor operation efficiency, and improving the motor performance.

[0092] Here, the electrical equipment may be household appliances such as fans, air-conditioning compressors, refrigerator compressors, drum washing machines, etc., or electrical equipment in the fields of industrial control and transportation, etc., all of which are within the protection scope of the present utility model.

[0093] A motor according to a specific embodiment of the present utility model is described in detail below with reference to the accompanying drawings. It is worth noting that the following description is only an exemplary illustration and cannot be construed as a limitation to the utility model.

[0094] like Figure 1-Figure 3 As shown, the motor according to the embodiment of the utility model can be applied to a compressor, and the motor includes a stator assembly and a rotor assembly, and the rotor assembly is sleeved outside the stator assembly. The stator assembly includes a plastic package, a stator core 100 and a stator winding, and the stator winding is wound around the tooth portion 11 of the stator core 100, and the plastic package plastic packages the stator core 100 and the stator winding. The stator core 100 includes a plurality of stator teeth 10, and the stator teeth 10 include an integrally connected tooth portion 11, a tooth boot 12 and a matching portion 13, the radial inner end of the tooth portion 11 is connected to the matching portion 13, and the radial outer end of the tooth portion 11 is connected to the tooth boot 12. The width of the matching portion 13 along the circumferential direction decreases inwardly, and the matching portions 13 of the plurality of stator teeth 10 are spliced ​​in sequence along the circumferential direction, and the fixing between the plurality of stator teeth 10 is achieved by cooperating with the plastic package of the plastic package.

[0095] The cross section of the tooth portion 11 perpendicular to the axial direction of the stator core 100 is a rectangle, the width of the mating portion 13 along the circumferential direction decreases inwardly, and the stator tooth 10 is made of oriented silicon steel, and the orientation direction is parallel to the length direction of the rectangle, that is, the radial direction of the tooth portion 11. The tooth shoe 12 extends perpendicularly to the radial direction of the tooth portion 11 toward the inner side surface of the tooth portion 11.

[0096] The motor of the above embodiment has a high slot fill rate of the stator winding in the stator slot, which is beneficial to improving the torque density and motor operating efficiency. The torque is further improved by using oriented silicon steel, and the copper loss and iron loss are reduced, thereby further improving the efficiency.

[0097] Other structures and operations of the motor and electrical equipment according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0098] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0100] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stator core, characterized in that: include: A plurality of stator teeth, each stator tooth comprising a tooth portion, a tooth shoe and a matching portion, wherein the tooth portion extends radially along the stator core, and radial ends of the tooth portion are respectively connected to the matching portion and the tooth shoe, wherein: The plurality of stator teeth are arranged along the circumference of the stator core, the size of the matching portion along the circumference of the stator core decreases in the direction away from the tooth portion, and the matching portions of the plurality of stator teeth are connected end to end along the circumference of the stator core to define a stator hole.

2. The stator core according to claim 1, characterized in that: The two side surfaces of the matching portion in the circumferential direction of the stator core are respectively a first side surface and a second side surface, one of the first side surface and the second side surface extends parallel to the radial direction of the tooth portion, and the other extends obliquely relative to the radial direction of the tooth portion.

3. The stator core according to claim 1, characterized in that: Two side surfaces of the matching portion in the circumferential direction of the stator core are respectively a first side surface and a second side surface, and both the first side surface and the second side surface extend obliquely relative to the radial direction of the tooth portion.

4. The stator core according to claim 1, characterized in that: The shapes of the side surfaces of two adjacent matching parts facing each other match each other, and the two adjacent matching parts are clearance fit, transition fit or interference fit.

5. The stator core according to claim 1, characterized in that: One of the mutually opposite side surfaces of two adjacent matching parts is provided with at least one first limiting recess, and the other is provided with a first limiting protrusion which is inserted into the first limiting recess in a one-to-one correspondence.

6. The stator core according to claim 1, characterized in that: At least one first limiting recess and at least one first limiting protrusion are provided on mutually opposite side surfaces of two adjacent matching parts, and the first limiting protrusion of one of the side surfaces is inserted into the first limiting recess of the other side surface.

7. The stator core according to claim 5 or 6, characterized in that: The structures of the plurality of matching parts are the same.

8. The stator core according to claim 5, characterized in that: The multiple matching parts include a first matching part and a second matching part. The first matching part has first limiting recesses on both sides, and the second matching part has first limiting protrusions on both sides. The first matching parts and the second matching parts are alternately arranged along the circumferential direction of the stator core.

9. The stator core according to claim 1, characterized in that: The tooth shoe is provided with a slot, and the end of the tooth portion radially away from the matching portion is provided with an inserting portion, and the inserting portion is inserted in the slot.

10. The stator core according to claim 9, characterized in that: The shape of the slot matches the shape of the plug-in portion, and the outer surface of the plug-in portion is clearance-fitted, transition-fitted or interference-fitted with the groove wall surface of the slot.

11. The stator core according to claim 10, characterized in that: The size of the plug-in portion along the circumferential direction of the stator core is equal to the size of the tooth portion along the circumferential direction of the stator core; or, The plug-in portion is provided with a second limiting recess on one of the surface of at least one side of the stator core in the circumferential direction and the slot side wall of the slot, and the other is provided with a second limiting protrusion embedded in the second limiting recess; or, The dimension of the inserting portion along the circumferential direction of the stator core decreases in a direction away from the matching portion.

12. The stator core according to claim 1, characterized in that: The dimensions of the tooth portion along the circumferential direction of the stator core are equal everywhere, the tooth portion is made of oriented silicon steel, and the orientation direction is parallel to the radial direction of the tooth portion.

13. The stator core according to claim 1, characterized in that: A side surface of the tooth shoe facing the tooth portion extends perpendicularly to the radial direction of the stator core; or a side surface of the tooth shoe facing the tooth portion is an arc surface, and a central axis of the arc surface coincides with an axis of the stator core.

14. A stator assembly, characterized in that: It comprises a stator winding and a stator core according to any one of claims 1 to 13, wherein the stator winding is wound around the tooth portion.

15. The stator assembly according to claim 14, characterized in that It comprises a plastic-encapsulating body, wherein the plastic-encapsulating body encapsulates the stator core and the stator winding.

16. A motor, characterized in that: It comprises a rotor assembly and a stator assembly according to claim 14 or 15.

17. The electric machine according to claim 16, characterized in that The number of poles Np of the rotor assembly is greater than 2 and less than 30; the number of teeth Ns of the stator teeth is greater than 3 and less than 30; and the absolute value of Ns-Np is greater than or equal to 1 and less than or equal to 6.

18. An electrical device, characterized in that: Comprising an electric machine according to claim 16 or 17.

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